Head gasket, or ?????
I have a 66 coupe, 1968 302 block, fairly aggressive Crower roller cam, hyd. lifters, roller rockers, alum. heads. The motor has about 300 to 400 miles on it.
About two weeks ago I got on it a little (opened secondaries) and the heater hose came off the fitting on the intake manifold. Put it back together and checked all the other clamps. They were all just a little loose, so I figured the heater hose just wasn't tight enough.
Today I jumped on it pretty good up through 3rd gear. There is now water coming out between the intake and the head just above #4. I can see the gasket is blown out there and the water just flows out with the motor running.
I would think head gasket, but I checked compression and all cylinders had 130 to 140, with most at 135. If the head gasket was letting pressure in the the water jacket, wouldn't compression be down on that cylinder.
I know I have to take the intake off and replace the gaskets, but should I pull the heads at the same time, or put the intake back on and then use the tester to check for combustion gasses in the radiator. Any thoughts on what the problem may be are appreciated.